Suppose the population over age 15 is 160 million, the number of discouraged workers is 5 million, the participation rate is 75 percent and the unemployment rate is 10 percent. How many officially unemployed are there?
a) less than or equal to 10 million
b) greater than 10 and less than 15 million
c) greater than or equal to 15 million but not more than 17 million
d) more than 17 million